WordPress.org

1. Upload to the /wp-content/plugins/ directory
2. Activate the plugin through the 'Plugins' menu in WordPress
3. find the "fx" button on you wordpress TinyMCE editor

You can also use this editor to only input latex code and let plugins like quicklatex, mathjax or Latex for WordPess to convert it to equation image, you'd better change line 90 in editor_plugin.js tinyMCE.activeEditor.execCommand('mceInsertContent', false, ''); to tinyMCE.activeEditor.execCommand('mceInsertContent', false, '\['+latex+'\]'); inorder to only copy LaTex code to TinyMCE textarea when click the copy button.